Programmable Capacitive Tuning IC 8-Pin SON

The CTST571 is a digitally programmed capacitor designed to tune a filter or crystal/SAW based oscillator to a desired center frequency. Through a bank of registers, the capacitance value is set by a serial data stream and if desired, can be permanently stored in the nonvolatile EEPROM memory. The CTST571 is designed to be a labor and cost saving device within the oscillator production process and provide the desired functionality for tunable filter banks. While incorporating very small step sizes (0.063pF), multiple CTST571 devices can also be used in parallel to obtain higher overall capacitance values. The CTST571 is available in an SON8 package (1.5mm x 1.0mm) for very small form factor designs.

• Capacitive Tuning Range of 6.6pF to 37.553pF
• 0.063pF Minimum Step Size
• Continually Programmable with Register or EEPROM Data Storage
• May Be Placed in Parallel for Greater Capacitance Values
• 2.5V to 5.0V Supply Voltage
• RoHS compliant Pb Free Packages